Method of selecting nuclides to be evaluated when evaluating the radioactivity of radioactive contamination

摘要

PROBLEM TO BE SOLVED: To easily select a nuclide to be evaluated while ensuring safety when determining a clearance for waste handled in decommissioning of a nuclear reactor or the like. Dk is calculated for all nuclides (S1). Next, Q0 is calculated based on all Dk, and Q1 is calculated as an index value for selection based only on the Dk of the important nuclide (10 types) (S2: calculation step). When Q1 / Q0 ≥ 0.9 (S3: No), it is recognized that the contribution of nuclides other than the important nuclides (10 types) cannot be ignored. Select in descending order of / Ck, and the nuclides added here are selected in addition to the important nuclides (10 types) (S7: selection step). In calculating Dk, the lower limit representative value for important nuclides (10 types) and the upper limit representative value for nuclides other than important nuclides (23 types) are used as representative values for the composition of each element. Be done. [Selection diagram] Fig. 2